Please edit this to use words like "attack" and "round" instead of "turn" where appropriate; "first and second turn" is confusing in a 3.5 context. Clarity and context are crucial for relevant answers.
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BESWFeb 25 '13 at 12:19

3 Answers
3

The rogue’s attack deals extra damage any time her target would be denied a Dexterity bonus to AC (whether the target actually has a Dexterity bonus or not), or when the rogue flanks her target.

There are some additional restrictions (immunity to critical hits or fortification, miss chance or concealment, improved uncanny dodge), but those are always a target's ability, lacking which you can sneak attack many times in a round, if the target is denied its Dexterity bonus to AC during each attack. Of course, if the target is denied Dexterity bonus to AC only against first attack (as is the case with striking from under invisibility, for example), only the first attack would be sneak attack.

As for your second question - no, it is not normal (as in "to my knowledge average gaming group does not use this houserule"), and no, it will just nerf the poor rogue, who cannot really brag about excessive combat ability in the first place.

Yes, you can and frankly must if you want to be relevant in combat

There is minimal reason to play a Rogue in the first place if you cannot get multiple Sneak Attacks per round, on almost every round. Rogues have to be built for doing so if they want to contribute in combat. The typical Rogue needs options for

movement-without-a-move-action (so they can always full-attack)

improvements on their ability to flank (island of blades from Tome of Battle is a great thing to get for a couple of feats or a dip)

methods of causing flat-footed status on their own (wand of grease, ring of blinking, marbles, etc.)

more attacks in a full-attack (Two-Weapon Fighting, Rapid Shot, etc.)

Without these, a Rogue will have very little ability to contribute in combat. Even a fairly simple charge-based Barbarian or Fighter build can out-damage a Rogue (use a Lance in two hands and Power Attack), usually with fewer restrictions on how easily he can apply his damage (nothing is outright immune, usually easier to Charge than it is to Flank, and so on). The above bullet points are just for keeping up to an extent and not being useless. Most Rogues also focus on skills, particularly stealth, party face, and Use Magic Device, to shore up the fact that the damage they bring to the table is not as good as the others.

It depends. In non-flanking situations, whenever the target is denied his/her Dex bonus to AC, your attack against the target qualifies for sneak attack damage. If your initial attack (main hand) somehow alerts the target such that the target gains his/her Dex bonus to AC again, then your off-hand attack would not gain a sneak attack bonus. This situation might occur when attacking while under the spell of Invisibility. The first attack would cancel the Invisibility, so subsequent attacks would not catch the target without his/her Dex bonus to AC.

If you wield a second weapon in your off hand, you can get one extra attack per round with that weapon.

There is nothing in that statement that suggests that the extra attack occurs simultaneously. The rules only states that the extra attack occurs on the same round, which is a 6 second-long span of time.